The SMART_PLAT_BIG, SMART_PLAT_RED, and SMART_PLAT_SMALL objects are
platforms which can be used as elevators or moving floors.
The STEP is a platform-like object which has no features other than the
ability to be walked upon.
The TELE2 object will transport the player to the position of the object
that it is linked to.
The TP_DOOR object will transport the player to another TP_DOOR that is
linked to it.
Markers and Indicators
MARKER objects serve no purpose other than to hold links for other
objects that require links. Markers can also be used to mark features
of a level for editing purposes without requiring a visual cue that will
be visible when the level is played.
The INDICATOR object changes color from red (when its link is active)
to green (when its link is inactive). This object is used to give
the player a visual clue as to the state of an object.
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